linux-kernel - Re: [linux-next] rootfs: rootflags take effect when mount rootfs

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Message-ID: <YNhW/XQlZxfJR9Us@kroah.com>
Date:   Sun, 27 Jun 2021 12:46:21 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Weilong Chen <chenweilong@...wei.com>
Cc:     viro@...iv.linux.org.uk, keescook@...omium.org,
        linux-kernel@...r.kernel.org
Subject: Re: [linux-next] rootfs: rootflags take effect when mount rootfs

On Sat, Jun 26, 2021 at 09:16:55AM +0800, Weilong Chen wrote:
> The kernel root filesystem may use the rootflags parameters
> when mount, especially for tmpfs, to setup a variety of features.
> 
> For example:
> 1. Add 'rootflags=huge=always' to boot args.
> 2. When the OS bootup:
> rootfs on / type rootfs (..., huge=always)
> Then we can get the hugepage performance improvement of tmpfs.
> 
> Signed-off-by: Weilong Chen <chenweilong@...wei.com>
> ---
>  fs/namespace.c       | 5 +++--
>  include/linux/init.h | 2 +-
>  init/do_mounts.c     | 4 +++-
>  3 files changed, 7 insertions(+), 4 deletions(-)

No documentation update for this new user/kernel api you added?